* feat(ui): drop the desktop top bar in favor of sidebar navigation
The Control UI top bar only rendered the OpenClaw › agent › page breadcrumb
on desktop, duplicating the sidebar. Desktop now renders no topbar row; the
row returns solely as the chat split toolbar's backdrop. Narrow viewports
keep the header (drawer toggle, brand, command-palette search) and now show
the brand across the whole drawer range. Routing already uses pushState, so
browser back/forward traverses navigation.
* feat(macos): add back/forward controls to the dashboard window
Native titlebar buttons next to the traffic lights drive WKWebView history,
which carries the Control UI's pushState navigation; enabled state tracks
canGoBack/canGoForward via KVO and trackpad swipe gestures are enabled too.
Back/forward traversals to entries from a replaced gateway endpoint cancel
silently instead of opening a dead URL in the system browser.
* fix(macos): keep the dashboard drag strip off the web content column
With the desktop topbar row removed, the 28px mid-window drag region sat on
top of the content column (chat thread has no top padding) and swallowed
clicks as window drags. Shrink it to a 12px edge strip; the sidebar region
over the reserved native-chrome padding stays the primary drag surface.
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